[anti-censorship-team] Graphs of Snowflake bridge bandwidth since March 2024 domain fronting changes

[David Fifield]

Here are some graphs of the bandwidth at the 2 Snowflake bridges since
the end of domain fronting on Fastly on 2024-03-01
(https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/135)

You can compare this to similar analysis made in October 2023, after a
similar situation when the default front domain changed from Fastly to
Cloudflare:
https://lists.torproject.org/pipermail/anti-censorship-team/2023-October/000320.html

1. As before, snowflake-02 was relatively harder hit than snowflake-01.
   But this time it didn't get nearly as close to zero. However, there's
   an evident secondary step down on 2024-03-07, which may or may not be
   related.
2. Also as before, snowflake-02 suddenly (within 10 minutes) recovered a
   large amount of bandwidth about 14 days later, at 2024-03-15 10:45. A
   similar sudden increase is visible with snowflake-01 at the same
   time. Last October, it (if it is indeed the same effect) happened at
   about 11:45, one hour later UTC.
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